Stovepipe-thimble



(No Model.)

JJR. BOSTWIGK. STOVEPIPE THIMBLE.

No. 569,165. Patented.O0t.- 13,*1896.

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UNITED STATES PATENT OFFICE.

JOHN R. BOSTWVICK, OF CLIFTON SPRINGS, NEW YORK.

STOVEPI PE-THIM BLE.

SPECIFICATION forming part of Letters Patent No. 569,165, dated October 13, 1896.

Application filed January 4, 1895.

To all whom it may concern:

Be it known that I, J OHN R. BOSTWICK, of Clifton Springs, in the county of Ontario and State of New York, have invented a new and useful Improvement in Stovepipe-Thimbles, which improvement is fully set forth in the following specification and shown in the ac companying drawings.

My invention relates to two-part expansible stovepipe-thimbles; and the improvement consists of a novel stovepipe-thimble, as hereinafter described and claimed.

Referring to the drawings, Figure 1 represents a plan view of a thimble embodying my invention, parts being broken away. Fig. 2 represents a side elevation and broken away, showing a partial section. Fig. 3 represents a longitudinal section thereof on a larger scale than in Figs. 1 and2. Fig. 4 represents a side elevation of a part of the invention on the scale of Fig. 3.

Similar letters indicate like parts in the different figures.

A designates the thimble, preferably made of sheet metal and cylindrical in form, and consists of two main overlapping sections B and O, adapted to telescope one within the other, as shown. Each section is provided at its outer or free end with a perforated head 12, formed with an external concentric rib or bead to, within the hollow of which the cylindrical part of the section rests, said part and the head being soldered rigidly together. The inner main section 0 has its free end turned over to form a stiffening-bead c, which may be empty, as shown in Fig. 2, or filled with a wire D, as shown in Fig. 3, as may be desired.

Upon the inner surface of the section 0 and adjacent to the stiffening-bead are secured,by solderor otherwise, screw-nuts e, there being preferably two, diametrically opposite each other, as shown.

ff are fastening-screws for the sections B O, threaded transversely in the respective nuts, in position to bear against the inner surface of the section B. The bearing ends of these screws are preferably pointed, so that when pressed against the part B they will sink into the latter and press the metal outward in the form of minute cones g g, as appears in an exaggerated form in Fig. 2. By these means the two sections are firmly held in Serial No. 533,797. (No model.)

whatever position they may be set or adj usted and no relative longitudinal motion can take place between them. The screw-nuts may be of any convenient form, as round, square, or oblong, as may be desirable, and in case they are made long, as shown in Fig. 4, they act as stiffeners for the part 0, assisting to resist the inward pressure exerted by the action of the screws.

The nut c, Fig. 3, is formed with an internal cavity h at the point of the screw, the latter being provided with an enlargedpart or flange i, rigid with the screw, fitted or formed on the end thereof after the screw has been passed through the nut. This flange serves the double purpose of preventing the screw being turned out of the nut and becoming lost, andalso forms a stop to prevent the screw being forced too far into or through the wall of the section Bwhen pressed thereagainst.

The screw being inserted in the section 0, near the bead 0, receives the support afiorded by the stiffness of the bead, and also being near the edge of the section admits of the parts being drawn out so as to overlap but little and still hold firmly together, this being necessary when the floor-joists are, deep or the wall through which the thimble is placed is thick.

The manner of fastening the nuts to the section 0 is a matter not essential to my invention. If, for example, the pipe passing through the thimble in any case is liable to become highly heated, the nuts if held only by solder might be loosened by the action of the heat. In this case rivets are preferable for holding the nuts in place, though ordinarily soldering them is suflicient.

In practical use when the section B is first inserted horizontally through the wall or downwardly through the floor the section 0 may be entered from the other side or from beneath without regard to the relative position of the two sections as regards the turning of either upon its axis, for as the fastening-screws are adapted to bear upon any part of the concave surface of the section B it makes no difference how the sections go together, or, in other words, it is not necessary to turn the section 0 uponits axis to bring any particular part of the section to register the nuts being provided'each with a slight I internal cavity whereby they are adapted to the employment of rigid collars or enlarged it I 5 parts on the screws near the points of the latter, substantially as and for the purpose setforth.

In witness whereof I have hereunto set my hand, this 26th day of December, 1894, in the :0 presence of two subscribing witnesses.

JOHN R. BOSTVICK. YVitnesses:

WILLIAM SNYDER,- J. E. WILBUR. 

